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Comment on Class Activity 1

Section 2.5, part 11 Modular arithmetic

Section 4.5, part 2 Example involving images

Section 4.5, part 4 Inverse image of unions and of intersections

Section 4.5, part 5 Image of unions and of intersections

Section 4.5, part 3 Example involving inverse image

Section 4.5, part 1 Image and inverse image of sets

Section 4.3, part 6 Example involving injectivity

Section 4.3, part 8 Bijections and inverses

Section 4.3, part 5 Injections

Section 4.3, part 4 Yet another example involving surjectivity

Section 4.3, part 2 Example involving surjectivity

Section 4.3, part 3 Another example involving surjectivity

Section 4.3, part 1 Surjections

Section 4.2, part 3 Inverse function and composition

Section 4.2, part 4 Restriction and extension

Section 4.2, part 2 Composition of functions

Section 4.2, part 1 Inverse of a function

Section 4.1, part 2 Some special functions

Section 4.1, part 1 Functions Basic definitions

Section 3.3, part 4 Use of equivalence Class Theorem to construct Z from N

Section 3.4, part 2 Sup and inf

Section 3.4, part 4 Existence of the square root of 2

Section 3.4, part 1 Partial orders and linear orders